@zacts There is Wine on Linux for which you can run FL Studio 11. There is also LMMS which should work with most FL Studio files / MIDI keyboards.
@mitchell @zacts don't forget the ms-corefonts package for FL Studio + wine, otherwise you won't see fonts in menus and whatnot
@chu @zacts On the latest wine-dev this shouldn't be an issue as it should have a detected patch. However don't quote on that :P
@mitchell @zacts @chu If anything, you can try wine-staging.